Loading .Rdata within an R function

Colleagues:

I am having trouble loading data from within .Rdata file
within the environment of a function.  That is,
the following always loads to the global environment:

   f1 <- function()    {

           load("mydata.Rdata")

           #  compute with objects from mydata.Rdata.

           }

I wish to load mydata.Rdata only within the function f1.
Perhaps I have misunderstood the capabilities of load(),
or the environment concepts.